from what I know and have read bamboo is not toxic to cats. But it is always worth that call to the vet just to ask and be safe. Here is a list of toxic plants to cats:

Aloe Vera
Arrowhead Vine (all parts)
Asparagus Fern
Azalea
Bird of Paradise (fruit, seeds)
Boston Ivy (all parts)
Caladium (all parts)
Calla Lily
Christmas Rose
Chrysanthemum
Creeping Charlie (all parts)
Creeping Fig
Crown of Thorns
Daffodil
Dieffenbachia
Dumbcane (all parts)
Easter Lily
Elephant Ears
Emerald Duke (all parts)
English Holly
English and Glacier Ivy (leaves and berries)
Heartleaf (all parts)
Ivy (Hedera)
Jerusalem Cherry
Lily of the Valley (all parts)
Majesty (all parts)
Marble Queen (all parts)
Mistletoe
Nephthytis (all parts)
Parlor Ivy (all parts)
Philodendron (all parts)
Poinsettia (leaves and flowers)
Pothos (all parts)
Pot Mum
Red Princess (all parts)
Saddleleaf (all parts)
Schefflera
Spider Mum
Sprengeri Fern
Swiss Cheese Plant
Tulip (bulbs)
Umbrella Plant (all parts)
Weeping Fig
(Ficus)